Chrooting to gentoo

So after many errors I will make a step by step guide to chroot into a gentoo system.

Connect to the network

net-setup  

Sync the clock

    chronyd  

Mount the root partition

mount /dev/sda1 /mnt/gentoo  

Mount the boot partition

mount /dev/sda3 /mnt/gentoo/boot  

Activate swap

swapon /dev/sda2  

Change root

arch-chroot /mnt/gentoo